Solo founder chicken and egg problem

anybody successfully dealing with the chicken or the egg problem of marketing first or tweaking/adding features first to capture those users?

thinking about this a lot right now with my project Foundation, a library of blogs/essays from founders and thinkers in the (mostly) tech space

my chicken vs. egg, right now, specifically is: design social proof into the home page or focus on marketing. the answer, I am sure, is both ha.

here's the project for the curious (https://foundationessays.com/)